How many GPM from the water pump?
I'm looking at going to an electric water pump on my rallycross boxster. Anyone know how many gallons per minute the factory water pump puts out?
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Drop a factory PMS electric water pump into the front and call it a day. You can find them pretty cheap and installation doesn’t seem to be too terribly difficult.
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By slowing the water flow it allowed a proper heat exchange... |
I knew a guy with a 944 and an electric water pump that he could control from the cockpit and essentially set the water temp wherever he wanted by speeding up or slowing down the pump. But I guess you still have to start with the right approximate flow... I have no idea unfortunately the GPM :-(
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Woody; I think what will determine the GPM is the size of the coolant pipes to the front of the car. I know you know the diameter of your pipes, but my thought was for 1.5" id pipe size you could flow 35 GPM at 0 psi. Attached is a chart that can give you various pipe diameters.
https://www.hy-techroofdrains.com/water-flow-through-a-pipe/ |
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You could run an experiment. Do some math and figure out the actual pump rpm while the motor is turning at 6k. Then rig a drill to drive the pump, run water from one 5 gal bucket through the pump > through the plumbing and radiators, back to the motor, and into a second 5 gal bucket. Fire up the drill to simulate the engine at 6k and time the process to fill bucket #2. This would reveal the max flow needed from an electric pump. Hook up your chosen pump and test it to make sure it meets or exceeds your minimum required gpm through the system. Allow your t-stat to regulate engine temp by opening and closing as needed to keep coolant at 180F-220F. I don't know anyone who has measured this on a Boxster but it would be very useful in a racing application. The drag racing guys have been doing this for years on V8s. https://www.chevyhardcore.com/tech-stories/fuel-cooling-ignition-tech/tech-feature-what-you-should-know-about-electric-water-pumps/ |
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Only problem I see is finding a drill that will go to 6k rpm. A dremel will, but probubly doesnt have the power to spin the WP Might need to rig up a motor and pullys to get to that rpm |
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Without doing any of this you could probably just use a 12VDC external pump designed for V8 engines and get close enough... maybe 20-40gpm. I like this idea a lot. With a 12V WP and a 12V PS pump you would remove a lot of parasitic drag from the motor and get better steering, better cooling, and higher reliability. Probably 15-20 HP at higher RPM. |
How about an electric water pump with a stand-alone controller that varies pump speed in response to cooling needs ?
https://daviescraig.com/?gclid=EAIaIQobChMIu4SqyMGe4wIVCLbICh0toQcpEAAYASA AEgJk0fD_BwE |
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In case someone is searching about electric water pump and comes across this thread. I've successfully installed one and you can see the install here. http://986forum.com/forums/show-tell-gallery/73877-6-months-live-build-thread.html#post604898
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